JPS6095021A - Measuring method for bearing power of soil - Google Patents

Abstract

PURPOSE:To improve measuring precision, by a method wherein, through a lifting tool having an arm part energized by a spring and releasing a weight from grasping through the working of an electromagnet, a weight, engaged with a rod, is lifted up and released from grasping. CONSTITUTION:With a lifting tool 9 lowered through reverse running of an electric motor M, after a slope surface 45 of a coupling part 43 is brought into contact with the upper surface of a flange 3a of a weight 3 and an arm part 10 is forcibly opened against a spring 6, a grasping part 10a is engaged with the under surface of the flange 3a to grasp the weight 3. Thereafter, when, with the weight 3 lifted together with the lifting tool 9 through forward running of the electric motor M, a contact probe 27 makes contact with a contact piece 51, and a switch 54 is turned ON to energize an electromagnet 7. Thereafter, through magnetic repulsion action between the electromagnet 7 and a permanent magnet 41 of the arm part 10, the grasp part 10a is opened, and the weight 3 is dropped. Further, the weight 3 exertes an impact on a rod 4 through a drop pad 8 to insert a cone part 26 into a ground.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a soil bearing force measuring device equipped with a lifting device that uses a spring and an electromagnet to drop a weight from a predetermined height.

C Background technology] To inspect the bearing capacity of road subgrades and roadbeds, a weight of a predetermined weight, for example 50 kg, is dropped a predetermined distance (usually 50 cm), and the rod is driven into the ground by the impact of the fall. This type of soil bearing capacity measuring device is often used. However, with this device, the weight had to be dropped many times, and the lifting was done manually, so the measurement work was tiring and the measurement accuracy tended to be inaccurate.

In order to solve such problems, the present applicant filed the U.S. Pat.
Publication No. 19660 proposed a soil bearing strength measuring device that uses an electric motor to raise a weight, but this device was designed to detect the overcurrent of the motor and determine the rounded-up height. The circuit was complicated and maintainability was somewhat poor.

[Purpose of the invention]

An object of the present invention is to provide a soil bearing strength measuring device that can solve the above-mentioned problems, based on the fact that a lifting tool that can drop a weight using an electromagnet is attached to a string.

[Disclosure of the invention]

An embodiment of the present invention will be described below based on the drawings.

In the figure, a soil bearing capacity measuring device 1 has a support 2 supporting a rod 4 for measuring soil bearing capacity having a weight 3, and
One end of the string 5 passing through the upper part of the support column 2 is connected to the electric motor M so as to be able to be wound thereupon, and the other end is provided with a lifting tool 9 that grips and releases the weight 3 by means of a spring 6 and an electromagnet 7. It's tied together.

The support column 2 is erected in front of a box-shaped base 11,
Also, at its upper end, there are pulleys 13.1 on both ends extending back and forth.
4 is fixed, and support pieces 19.2o protruding from above and below the front bracket of the support column 2 allow the rod 4 to be loosely inserted thereinto and support the rod 4 so as to be freely descendable. Further, the supporting piece 19 is provided with a through hole through which the string 5 passes, and a supporting piece 21 for guiding the string 5 is provided protruding from the rear upper end of the support 2 as well.

The base 11 has a box shape, and houses therein the winding drum 23 to which one end of the cord 5 is fixed and the electric motor M, and the cord 5 is rotated by forward and reverse rotation of the electric fiM. Can be rolled up and rewound.

The rod 4 has a cone portion 26 for driving at the lower end and is composed of a circular shaft that can be replaced, and a rod 8 is fixed to the rod 4. In addition, a circumference i8a is formed on the body,
In this circumferential groove 8a, a projecting piece 2 provided at the lower end of the base 28 of the lifting height setting device 30, which is loosely fitted to the support 2 so as to be vertically movable.
9 are fitted together, and a contact piece 27 is formed at the upper end of the base 28 and projects toward the rod 4. The weight 3 is loosely inserted into the rod 4 above the support amount 8, and is pulled up by the lifting tool 9 and falls, thereby applying a falling impact to the weight 8. Also, the weight 3 has a flange 3a on its top.
Expand.

The pulling tool 9 is attached to the upper end of the cylindrical portion 31 through which the rod 4 is inserted.
A case 3 to which a rectangular parallelepiped-shaped cylindrical portion 32 that is open at the bottom is fixed.
3, and the cylindrical part 31 is formed shorter than the cylindrical part 32, and the cylindrical part 31 and the box body 32 are connected to a vertical connecting plate 34 and a position perpendicular to the connecting plate 34. The cylindrical portion 31 is connected at approximately the middle position by a horizontal joint plate 35 arranged therein.

Further, the electromagnet 7 is attached to the joint plate 35 with its magnetic poles facing forward and backward. Further, the arm piece 10 is housed in the case 33. The arm piece 10 has a pair of links 37.39 which intersect in an X-shape and are supported by the cylindrical portion 31 and the cylindrical portion 32, and a pair of links 37.39 pivoted at 736.
9 are respectively arranged on both sides of the cylindrical portion 31. Also link 37.
The upper end of the magnet 39 is bent toward the magnetic pole of the electromagnet 7, and a permanent magnet 41 having the same magnetic polarity as the electromagnet 7 on the opposite side is attached to the tip of the bent portion. Also, at the top,
The spring 6 is interposed between the cylindrical portion 32 and the cylindrical portion 32 .

Also, the lower part of the pivot point of the link 37.39 is bent inward in a dogleg shape, and the adjacent link 37.37.39.39
are connected to each other, and the connecting pieces 43 protrude inwardly, and an arcuate groove 44 approximately the same shape as the weight 3 is formed in the center thereof.

The upper surface of the connecting piece 43 is substantially horizontal, while the inner surface facing upward is formed with a slope 45 of 1g4 inward. Therefore, the arm piece 10 is biased by the spring 6, and the connecting piece 43 approaches and can grip the lower surface of the flange 3a of the weight 3.
form. An eye bolt 49 for connecting the string 6 is attached to the upper surface of the case 33, and a tiltable contact piece 51 that comes into contact with the contact piece S27 is attached to the front surface of the cylindrical part 32. A switch 54 having an operating end protruding from the back surface of the piece 51 and a storage battery 53 are housed in the cylindrical portion 32.

Note that the electric motor M can be an AC motor or a DC motor, and when a DC motor is used, it can be driven using an automobile battery or the like.

Thus, the soil bearing capacity measuring device 1 reverses the electric motor M and lowers the lifting tool 9. After the slope 45 of the connecting piece 43 contacts the upper surface of the flange 3a of the weight 3 and is pushed open against the spring 6, the arm piece 10 of the lifting tool 9 engages the grip portion 10a with the lower surface of the flange 3a. and hold the weight 3. Thereafter, the electric fiM is rotated normally and the weight is pulled up together with the lifting tool 9. When the weight 3 is pulled up to a height of 50c+n, the contact piece 27 contacts the contact piece 51 and the switch 5
4 is turned on, and therefore the electromagnet 7 is energized, the grip portion 10a at the lower end of the arm piece 10 is held by the magnetic repulsion between the electromagnet 7 and the permanent magnet 41 of the arm piece 10.
Open it and drop the weight 3.

The weight 3 applies a falling impact to the support shell 8 and therefore to the rod 4,
The cone portion 26 is driven in according to the bearing strength of the soil, and the bearing strength of the soil can be measured by the depth of driving by repeating a predetermined number of times.

〔Effect of the invention〕

As mentioned above, the earth bearing capacity measuring device of the present invention can pull up and release the weight fitted to the rod through a pulling tool using a spring and an electromagnet, and since the lifting is done using an electric motor, it is possible to It simplifies the proof stress measurement work and improves work efficiency, and it also has many effects, such as being able to easily and accurately drop the weight from the correct height, helping to improve measurement accuracy.

Note that the earth bearing strength measuring device of the present invention can be used in various forms, such as connecting a cord that supplies power from an external power source to the electromagnet (or forming the grip part of the arm piece to be released by magnetic attraction with the electromagnet). It can be transformed into.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a perspective view illustrating a pulling tool, and FIG. 3 is a sectional view showing its operation. 2--Strut, 3--Weight, 4-Rod, 5--String, 6-Spring, 7-Electromagnet, 8--Body, 9--
- Pulling tool, 10... Arm piece, 10 a - One gripping part, 11... - Base. Patent applicant National Housing Industry Co., Ltd. Agent Patent attorney Tadashi Naemura

Claims (1)

[Claims] 11) By means of pillars erected on a base placed on the ground surface,
The pelvis is inflated and a weight is dropped onto the support rod to support the soil bearing capacity measurement, and a string is attached to the support that goes around the upper part of the support, and one end of the string is connected to an electric motor and wound. and a lifting device having an arm piece biased by a spring that can grip the weight and release the grip using an electromagnet is tied to the other end of the string. Yield strength measuring device. (2) The soil bearing force measuring device according to claim 1, wherein the arm pieces intersect in an X-shape, and a grip portion for gripping a weight is provided at the lower end of the arm pieces.